Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddecdccbdaba5c0a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-20 19:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d7a0e5c7a1ca4618693a2d6c9f890f2 SHA-1: cd19077ba0ac630bc9af7a293de53bb5c3ab6c26 SHA-256: ddecdccbdaba5c0a198a6d526eaceea175d3d2c154a1586b0d00975ad85c1bd7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm PDF, with numerous external URIs pointing to potentially malicious or phishing content. The presence of embedded URLs suggests the document's primary purpose is to redirect users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=how+to+delete+app+history+on+android PDF link annotation
    • http://letnipohar.cz/upload/file/gerevekilomaraweziduwuw.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133dbbeb9fb5---75424530840.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/wigekapisikurifizapa.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/99511812070.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/xibololixal.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/titanekezufetilopiwure.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/tavulodamaledinegotuda.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/84755296171.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/78918865818.pdfIn PDF document text
    • https://vpmemorial.net/images/file/burepujaxe.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/4882390695.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/zemipepusijedum.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/xuvuseze.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/kumovudosavenapanolojoju.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/35052876021.pdfIn PDF document text
    • http://generoussecurity.com/uploads/rutimopududo.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/gezowepurojozif.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/wavunojodipo.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210920_30BB563D690F8DF2.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/44263898404.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/87451310539.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/73430160487.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449562ef966---zawolep.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/10149827044.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/wisumugosisaruke.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/96358390732.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/dadarusaxesonewimo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBF 17888 bytes
SHA-256: 5fd4f4f9ecd86d53ca9eb86c733bb3d6b5a826ac1d742feda48cf14cdf904e2e
font_02_sfnt_off00011dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD6 10680 bytes
SHA-256: a1f838cf47c3c53fbcb2a63d1453eb9ece634000fc1e5dcef0f48cff1c2a886d